Asphalt Calculator
This asphalt calculator works out how much asphalt you need from the area and thickness, in tonnes and cubic meters. Enter the length, width, and depth and the asphalt calculator returns the volume and the weight, so you can order paving material accurately. It works for driveways, car parks, and roads, so figuring asphalt for any surface takes one step.
Results
The Asphalt Calculator is part of our Materials Estimating collection. Browse more materials estimating to size, convert, and check your work alongside this tool.
What the asphalt calculator does
Ordering asphalt means matching the surface area to the compacted thickness you need, and this asphalt calculator does that math. It multiplies the area by the thickness for the volume, then applies the asphalt density to give the weight in tonnes, since asphalt is sold by weight. Whether you are figuring asphalt for a driveway or a car park, the asphalt estimator turns dimensions into a tonnage you can order.
How the asphalt calculator finds the tonnage
Figuring asphalt is area times thickness, converted to weight:
The asphalt calculator multiplies the volume by the asphalt density, about 2.4 tonnes per cubic meter for hot-mix, to get the tonnage. Density varies a little with the mix, so an asphalt ton calculator using the supplier figure is most accurate. This is why a pavement calculator reports weight rather than volume: asphalt plants price and deliver by the tonne.
Asphalt calculator example
A driveway 10 m long and 5 m wide, paved 50 mm thick. Figuring asphalt by area and thickness:
So the driveway needs about 6 tonnes of asphalt. Enter your own numbers and the asphalt estimator returns the tonnage, matching what an asphalt tonnage calculator gives.
How to use the asphalt calculator
Enter the length and width of the area and the compacted thickness of asphalt you plan to lay. The asphalt calculator multiplies them for the volume and applies the density to return the weight. As an asphalt driveway calculator, enter the driveway dimensions; as a paving calculator for a larger lot, the same steps apply. It reports the tonnage an asphalt tonnage calculator would give.
Reading the asphalt calculator result
The weight in tonnes is what an asphalt plant charges and delivers by. Order a little extra, since asphalt compacts under the roller and spreads at edges, and a part-load is expensive to top up later. Compacted thickness matters most: a driveway wants 50 to 75 mm over a solid base, while a road-bearing surface needs more. The asphalt calculator gives the bare tonnage, so add around 5 to 10% for compaction and waste.
When to use the asphalt calculator
- Paving a driveway with the asphalt driveway calculator
- Estimating a car park with the paving calculator
- Ordering by weight with the asphalt tonnage calculator
- Costing a resurface with the pavement calculator
Common asphalt calculator mistakes
- Forgetting compaction. Asphalt rolls down, so add 5 to 10% to the asphalt calculator tonnage.
- Too thin a layer. A driveway needs 50 to 75 mm compacted; thinner cracks under load.
- Wrong density. Millings and porous mixes differ from hot-mix, so figuring asphalt needs the right density.
Tips for accurate results
- Add 5 to 10% to the asphalt calculator tonnage for compaction and waste.
- Use 50 to 75 mm compacted for a driveway, more for heavy traffic.
- Ask the plant for the mix density so the asphalt estimator converts exactly.
Figuring asphalt thickness and compaction
Thickness drives the tonnage, so figuring asphalt begins with the right depth for the job. A residential driveway needs 50 to 75 mm of compacted asphalt over a compacted stone base; a surface that carries heavy vehicles needs more, often in two layers, a binder course and a wearing course. Asphalt is quoted at its compacted thickness, but it is laid loose and rolled down, losing perhaps a fifth of its loose depth. The asphalt calculator gives the compacted tonnage, and adding 5 to 10% covers the roller compaction, edge spill, and the cold material that sticks in the truck.
Why the asphalt estimator uses tonnes
Unlike loose gravel, asphalt is almost always priced and delivered by weight, so the asphalt estimator converts your volume to tonnes using density. Hot-mix asphalt runs around 2.4 tonnes per cubic meter, but recycled millings, porous mixes, and different aggregate all shift that figure, which is why an asphalt millings calculator can give a different tonnage than fresh hot-mix for the same volume. Asphalt also has to be laid while hot, so a part-load or a second delivery is costly and can leave a cold joint. Getting the tonnage right the first time, with the asphalt calculator plus a compaction allowance, is what keeps a paving job on budget and seamless.
Asphalt tonnage calculator chart
Approximate asphalt tonnage for common areas at typical thicknesses, from the asphalt calculator (at 2.4 t/m³):
| Area | 50 mm thick | 75 mm thick |
|---|---|---|
| 25 m² | 3.0 t | 4.5 t |
| 50 m² | 6.0 t | 9.0 t |
| 100 m² | 12.0 t | 18.0 t |
| 200 m² | 24.0 t | 36.0 t |
Asphalt Calculator FAQ
How much asphalt do I need?
Multiply the area by the thickness for the volume, then by the density for the weight. The asphalt calculator does this, so figuring asphalt gives a tonnage you can order.
How is asphalt tonnage calculated?
Volume times density. Hot-mix asphalt is about 2.4 tonnes per cubic meter, so an asphalt tonnage calculator multiplies your volume by that to get the weight.
How thick should a driveway be?
About 50 to 75 mm of compacted asphalt over a solid base. Enter your thickness and the asphalt driveway calculator scales the tonnage.
Is asphalt sold by weight or volume?
By weight. Plants price and deliver by the tonne, which is why the paving calculator and asphalt ton calculator report tonnes rather than cubic meters.